5th-6th Sept 2018 Dublin, Ireland

RNA-mediated nutritional psychiatry (2)

Codon identity regulates mRNA stability and translation efficiency during the maternal-to-zygotic transition

The amino acid optimality code (Fig 6) provides an alternative perspective on sequence changes between paralogs in evolution and human disease.

Neo-Darwinian theorists dispense with Darwin’s food energy-dependent  “conditions of life.” They link mutations and disease to evolution via mathematical models. They exemplify human idiocy.
See for example: Neopterygian phylogeny: the merger assay
Reported as: Adaptive radiations in the Mesozoic

Bony fishes are the most diverse of all extant vertebrate groups. A comprehensive phylogenetic analysis of the group now provides new insights into its 250-million-year evolutionary history.

The claim about the 250-million-year evolutionary history can be compared to what happens when food energy-dependent fixation of a single RNA-mediated amino acid substitution occurs across a vertebrate lineage.
See: Evolution of gonadotropin-releasing hormone (GnRH) structure and its receptor

It is very surprising and fascinating that the coordinated evolutionary selection of amino acids participating in binding GnRH has resulted in such perfection, that no substitution with a natural amino acid in any position improves binding potency.

Evolution does not select amino acids. Natural selection for food energy-dependent pheromone-constrained viral latency links the substitution of achiral glycine in position 6 of the GnRH decapeptide to the biodiversity of all morphological and all behavioral phenotypes in all vertebrates.
See also: Handbook of Biologically Active Peptides (2013) Chapter 106 GnRH (LHRH)
Page 794 Figure 2 shows that food energy-dependent substitution of achiral glycine at position 6 stabilizes the folded conformation; increases binding affinity; and decreases metabolic clearance.

This feature is incorporated in all agonist and antagonist analogs.

Simply put, the substitution of achiral glycine in the GnRH decapeptide biophysically constrains viral latency in the context of ligand-receptor interactions and the physiology of pheromone-controlled reproduction.
See also: Role of olfaction in Octopus vulgaris reproduction
From the concluding paragraph:

Future work on O. vulgaris olfaction must also consider how animals acquire the odours detected by the olfactory organ and what kind of odour the olfactory organ perceives. The OL acting as control centre may be target organ for metabolic hormones such as leptin like and insulin like peptides, and olfactory organ could exert regulatory action on the OL via epigenetic effects of nutrients and pheromones on gene expression (Kohl, 2013; Elekonich and Robinson, 2000).

Kohl (2013) is Nutrient-dependent/pheromone-controlled adaptive evolution: a model
The facts that link vertebrates to invertebrates via olfaction and the 2013 model will almost undoubtedly be restated when Tuning Insect Odorant Receptors is published.
Until then, see:Evolution of Constrained Gonadotropin-releasing Hormone Ligand Conformation and Receptor Selectivity (2005)
Biophysical constraints link feedback loops from odors and pheromones to the functional structure of the GnRH decapepetide via achiral glycine in position 6. The link from food to the de novo creation of energy-dependent receptors is required in all organisms. They must select the right food, which helps to ensure their ability to reproduce.

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